User blog comment:Greninja20shiny/PVP team help/@comment-30155146-20180124055216

Mega's may look cool but you can only evolve one per battle.

Greninja(Torrent) is outclassed by both Battle Bond and Protean variants.

To build a team around greninja:

Pivots to take fighting/fairy/electric - grass types can be dealt with once you have the BP for Ice Beam, but more troublesome mons such as marshadow will outspeed and smash it. You need to switch out to something that can take these moves in place of greninja.

And... that's about it, given your parameters. Go to the pokemon help board with more pokemon or the #battle_arena channel in the general pbb discord if you want some actual tips.